AN994

L6385E

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L6385E

The L6385E (shown in Figure 4) is a high- and low-side configurable driver. It can control

the high- and low-side outputs (HVG and LVG) seperately, through the two related logic

inputs HIN and LIN. This device is provided with an undervoltage detection function in both

packages, this driver has been specifically designed for power supplies and motion control

applications.

Figure 5 and Figure 6 show the schematic diagram of the evaluation circuit and the layout of

the relevant PCB.

Table 2.

L6385E pin description

N.

Name

Type

Function

1

I

2

I

3

4

GND

Ground.

5

LVG

O

Low-side driver output. The output stage can deliver a 400 mA source and a 650 mA sink

(typical values). The circuit guarantees 0.3 V maximum on the pin (at Isink = 10 mA) with

resistor connected between the gate and the source of the external MOSFET normally

used to hold the pin low. The gate driver ensures low impedance in SD conditions as well.

6

OUT

O

High-side driver floating reference. Attention should be paid to the layout design of the

power stage so as to limit below-ground spikes on this pin.

7

HVG

O

High-side driver output. The output stage can deliver a 400 mA source and a 650 mA sink

(typical values). The circuit guarantees 0.3 V maximum between this pin and Vout (at Isink

the bleeder resistor connected between the gate and the source of the external MOSFET

normally used to hold the pin low.

8

Bootstrap supply voltage. This is the floating supply of the high-side driver. Includes a

between this pin and pin 6 can be fed by an internal structure named "bootstrap driver" (a

patented structure). This structure can replace the external bootstrap diode.

1.

The pull-down internal resistor is typically some hundred k

Ωs.